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Laminated formed body and method of manufacturing the formed bodyRelated Patent Categories: Stock Material Or Miscellaneous Articles, Hollow Or Container Type Article (e.g., Tube, Vase, Etc.), Polymer Or Resin Containing (i.e., Natural Or Synthetic)Laminated formed body and method of manufacturing the formed body description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20050287323, Laminated formed body and method of manufacturing the formed body. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND ART [0001] 1. Technical Field [0002] The present invention relates to a laminated and molded body such as a blow-molding aimed preform and a direct-blow molded bottle which are duly obtained by using a plurality of kinds of synthetic resins as materials and by coextruding them, and intends to bring about a variation of the color tone of the laminated and molded body to thereby further improve the aesthetic appearance thereof. The present invention further relates to a manufacturing method for manufacturing such a laminated and molded body. [0003] 2. Related Art [0004] As containers made of synthetic resin for accommodating cosmetics or the like therein, there have been numerously used molded articles such as obtained by injection molding or blow molding synthetic resins, from a standpoint to attain a suitable mass-production and a reduced manufacturing cost. However, most of such molded articles are monotonous or have color tones of less variation, thereby resulting in a still insufficient aesthetic appearance of containers. [0005] Thus, as described in JP-A-2000-117820, for example, it has been recently proposed to adopt such a technique to attain a variation of color deepness to be given to a container, for achieving a so-called gradation effect to thereby enhance the decorative effect of the container. [0006] The technique described in the above publication is to previously provide a parison with a wall thickness difference at the time of injecting a translucent colored resin, and then blow molding the parison, to thereby cause the parison to have a partially different wall thickness. According to this technique, it has been believed to be able to attain a pattern based on a color deepness without requiring any specific process and able to restrict the manufacturing cost to a lower degree. [0007] However, the above-mentioned related art still has problems which should be further improved, because the parison itself is provided with the wall thickness difference and thus the blow molded article also has the same wall thickness distribution as the parison, thereby complicating the wall thickness control upon blow molding, because those particularly thin portions of the container have a so lowered rigidity that the strength of the container is affected and that entrance of a gas (such as oxygen) from the exterior into the container becomes easy, thereby leading to an anxiety about a shortened quality assurance period for the contents accommodated within the container, because it is difficult to stably obtain molded articles having an excellent quality, and because the wall thickness of the dense color portion of the container is made to have a greater wall thickness than required to thereby lead to an increased cost when it is contemplated to preserve the rigidity of the whole container. DISCLOSURE OF THE INVENTION [0008] It is therefore an object of the present invention to propose a novel laminated and molded body and a manufacturing method therefor capable of solving the above-mentioned problems in the related art. [0009] The present invention provides a laminated and molded body obtained by coextruding and molding at least two kinds of resin materials, characterized in [0010] that at least one layer of the laminated and molded body comprises a colored layer having a thickness continuously or intermittently varied in a predetermined direction with respect to the extruding direction of the resin material of the colored layer (for example, in a direction parallel to the extruding direction and/or in another direction intersecting the extruding direction). [0011] Further, the present invention provides a manufacturing method of a laminated and molded body to be formed by coextruding at least two kinds of resin materials, characterized in [0012] that the method comprises the steps of: [0013] extruding a colored layer as at least one layer of the laminated and molded body, and [0014] controlling an extruding amount of the resin material of the colored layer such that the colored layer has a thickness continuously or intermittently varied in a predetermined direction with respect to the extruding direction of the resin material of the colored layer (for example, in a direction parallel to the extruding direction and/or in another direction intersecting the extruding direction). [0015] According to the present invention, it becomes possible to easily and assuredly obtain a laminated and molded body having an improved aesthetic appearance, by adjusting the supplying amount of the resin material forming the colored layer upon coextrusion. Further, the thickness of the resin material constituting the colored layer is continuously or intermittently varied along the predetermined direction, thereby allowing exhibiting such a visual effect, i.e., a so-called gradation effect that the color deepness of the colored layer is continuously or intermittently varied in the predetermined direction. For example, when the thickness of the resin material constituting the colored layer is varied in a direction parallel to the extruding direction, the color deepness of the colored layer is varied in the direction parallel to the extruding direction. Alternatively, when the thickness of the resin material constituting the colored layer is varied in a direction intersecting the extruding direction, the color deepness of the colored layer is varied in the direction intersecting the extruding direction. [0016] It is desirable that the full thickness of the laminated and molded body is substantially uniform along the predetermined direction with respect to the extruding direction of the resin material. Namely, it is desirable to control an extruding amount of the resin material of at least one layer other than the colored layer, such that the full thickness of the laminated and molded body is substantially constant along the predetermined direction. In this case, the full thickness of the laminated and molded body is substantially uniform over the whole of the laminated and molded body even when the thickness of the colored layer is varied. Thus, there is never caused locally increased or decreased wall thickness, thereby enabling to obtain a molded article having a quality stabilized in terms of strength and to provide a laminated and molded body having an enhanced gradation effect with a restricted cost. [0017] In the laminated and molded body having the above constitution, it is desirable that the colored layer has a thickness varied within a range of 50% of the full thickness of the laminated and molded body. [0018] The laminated and molded body according to the present invention is advantageously applicable to a body portion of a container such as: a blow-molding aimed preform to be used upon biaxial-stretching blow molding; a direct-blow molded bottle or direct-blow molded tube to be obtained by direct-blow molding a coextruded parison; and a tube. BRIEF DESCRIPTION OF THE DRAWINGS [0019] The present invention will be described hereinafter more in detail with reference to the embodiments shown in the accompanying drawings. [0020] FIG. 1 is an explanatory constitutional view of a laminated and molded body according to an embodiment of the present invention. [0021] FIG. 2 is an enlarged cross-sectional view of an essential part of the molded body shown in FIG. 1. 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